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15x-108=4x+13
We move all terms to the left:
15x-108-(4x+13)=0
We get rid of parentheses
15x-4x-13-108=0
We add all the numbers together, and all the variables
11x-121=0
We move all terms containing x to the left, all other terms to the right
11x=121
x=121/11
x=11
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